FLEX vs FlowStorm

FLEX is a free, open-source debugging and exploration library for iOS applications. It runs inside the app and places a toolbar in a window above it, allowing developers to inspect and change application state without an LLDB or Xcode connection or a remote debugging server. The tool can inspect view hierarchies, find live heap objects, show and modify properties and ivars, and call methods. Its network history covers NSURLConnection and NSURLSession requests with timing, headers, and responses. Developers can browse app bundles and sandboxes, inspect SQLite and Realm databases, and view or edit NSUserDefaults values, including strings, numbers, arrays, and dictionaries. FLEX works in the iOS Simulator and on physical devices, supports Objective-C and Swift, and requires an iOS 9-or-later target. Installation options include CocoaPods, Carthage, Buck, manual Xcode integration, and Swift Package Manager.

FlowStorm is a tracing debugger for Clojure and ClojureScript. It records execution without requiring breakpoints or code changes, then provides tools to step through code, inspect values, explore calls and functions, and investigate exceptions. A timeline displays execution events so users can follow how instructions from different threads interleave. The debugger also supports customizable real-time visualizations and plugins for specialized ways to examine recordings. Values shown in its interface can be sent to the REPL with one click, and recordings can be analyzed using Clojure. The guide covers ClojureScript in browsers, Node.js, and React Native, as well as remote debugging configurations and integrations for Emacs through Cider Storm, VS Code, and IntelliJ IDEA. FlowStorm is free and open source at free, and is listed for Linux, macOS, Windows, and self-hosted use. Minimum requirements are JDK 17 or later and Clojure 1.10.0 or later. Vanilla FlowStorm does not support async/await introduced in ClojureScript 1.12.145; the guide points to ClojureScriptStorm as an alternative.